#include <iostream>
#include <cstdio>


int main()
{
    //向标准输出中打印
    std::cout<<"Hello cout"<<std::endl;
    printf("Hello stdout\n");
    
    //向标准错误中打印
    std::cerr<<"Hello cerr"<<std::endl;
    fprintf(stderr,"Hello stderr\n");


    return 0;
}
